<template>
    <van-button
        v-if="isFollowed"
        class="follow-btn"
        type="info"
        color="#3296fa"
        round
        size="small"
        icon="plus"
        :loading="loading"
        @click="onFollow"
      >关注</van-button>
    <van-button
        v-else
        class="follow-btn"
        round
        size="small"
        :loading="loading"
        @click="onFollow"
    >已关注</van-button>  
</template>

<script>
import { addFollow, deleteFollow } from '@/api/user'
export default {
  name:'FollowUser',
  // 自定义 v-model 的数据名称
  model: {
    prop: 'isFollowed', // 默认是 value
    event: 'update-is_followed' // 默认是 input
  },
  props:{
    isFollowed:{
      type:Boolean,
      required:true
    },
    userId:{
      type:[Number, String, Object],
      required:true
    }
  },
  data(){
    return{
      loading:false
    }
  },
  methods:{
    // 关注和取消关注
    async onFollow(){
      this.loading = true
      try{
        if(this.isFollowed){
          // 已关注，取消关注
          await deleteFollow(this.userId)
        }else{
          // 没有关注，添加关注
          await addFollow(this.userId)
        }

        // 更新视图状态
        // this.article.is_followed = !this.article.is_followed
        this.$emit('update-is_followed',!this.isFollowed)
        // this.$emit('update-is_followed',!this.value)
      }catch(err){
        let message = '操作失败,请重试!'
        if(err.response && err.response.status === 400){
          message = '你不能关注你自己'
        }
        this.$toast(message)
      }
      this.loading = false  
    }
  }

}
</script>

<style>

</style>